I am also wondering about mounting depth... the above speakers would need Mounting Depth of 4-3/4", has a long magnet. It would be my first preference to get 6x9 instead od 6.5. I also came across MOPAR kicker 6x9 speakers which are upgrade by mopar.

You just go to crutchfield.com and buy some adapter plates for the 6.5. There is no issue with mounting depth of the Focals. Don't settle for anything less and stop trying to mix and match. IF you want awesome sound, you need a set of components and an amp. Anyhting less is just horse shit.

Well I've noticed from a few folks that initially their sound has been improved drastically with replacing the stock speaker set up. Yes with an amp and another 2000 bucks I'm sure it would be better but maybe we will put the rest on layaway and enjoy the total speaker replacement first then ease into the amp a little while after the new speakers break in because any thing is better then the stock setup.

I am also wondering about mounting depth... the above speakers would need Mounting Depth of 4-3/4", has a long magnet. It would be my first preference to get 6x9 instead od 6.5. I also came across MOPAR kicker 6x9 speakers which are upgrade by mopar.

You need to get a matching set. Your tweeters should have a matching Focal 6" or 6x9" with that model. Mixing can be done but you need to know what you are doing, I wouldn't attempt it myself without professional advice.